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Channel Capacity of BLAST based on the Zero-Forcing criterion  

Lee, Heun-Chul (Dept. of Communication Eng., Korea University)
Kim, Hee-Jin (Dept. of Communication Eng., Korea University)
Lee, In-Kyu (Dept. of Communication Eng., Korea University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.12, 2008 , pp. 34-41 More about this Journal
Abstract
In this paper, we present an asymptotical analysis of channel capacity of Bell labs layered space-time (BLAST) architectures based on a zero-forcing (ZF) criterion in the sense of signal-to-noise ratio (SNR). We begin by introducing a new relationship related to multi-input multi-output (MIMO) channel capacity. We prove that Diagonal Bell Labs Space-Time (DBLAST) attains the lower bound for MIMO channels when interference nulling is carried out based on the ZF-criterion. An exact closed-form expression for the probability density function of the channel capacity is analyzed. Based on the asymptotic behavior of the channel capacity of each layer, closed-form expressions for the asymptotic ergodic capacity are derived for BLAST. Based on the analysis presented in this paper, we gain an insight on the channel capacity behavior for a MIMO channel. Computer simulation results have verified the validity and accuracy of the proposed analysis for a wide range of antenna array sizes.
Keywords
Channel Capacity; multi-input multi-output; (MIMO) systems; Diagonal Bell Labs layered space-time (DBLAST); Zero-Forcing (ZF) criterion;
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